18 results about "Large droplet" patented technology

A droplet delivery device includes an ejector plate the produces a stream of droplets having a first large droplet size from a liquid supplied to the ejector plate and an impingement member that is positioned perpendicular to or at another non-parallel angle relative to an initial aerosol stream path produced from the ejector plate such that the one or more impingement members impinge the aerosol stream and reduce the size of droplets from the first larger size to one or more smaller droplet sizes.

This invention discloses a method for stabilizing the droplet transition state during oscillating arc welding. This method analyzes the oscillation function equation of the welding wire tip's trajectory and the spatial position of the substrate to obtain a time-varying function of the minimum distance between the welding wire tip and the substrate. Based on the characteristics of different droplet transition states during welding, a system optimization method is proposed to maintain a stable droplet transition state during welding, avoiding unstable droplet transition modes. The key point of the optimization scheme is that the distance from the welding wire tip to the two substrates is related to the welding torch oscillation at different positions. By adjusting the wire feed speed and the welding torch spatial position at different oscillation positions, the minimum distance between the welding wire tip and the two substrates remains relatively stable at any oscillation position, i.e., maintaining the peak distance for efficient droplet transition. By adjusting the minimum distance in real time, the droplet transition frequency is kept within a high range, preventing the generation of large droplets, reducing particle spatter, and improving the forming quality.

A method for forming an array of droplets by repeatedly splitting of a large droplet into smaller droplets. The method involves taking one or more large droplets and repeated splitting in multiple dimensions to form an array of smaller droplets within the original area of the array.

To increase speed and resolution and improve gradation.SOLUTION: A CPU of a printer, in a discharge treatment on the basis of one recording command, controls an actuator from a driver IC to selectively supply a drive signal for middle droplet D2, a drive signal for large droplet D3, and a drive signal for small droplet D1 of which resolution is higher than the resolution of the drive signal for middle droplet and the drive signal for large droplet.SELECTED DRAWING: Figure 7

The invention discloses a method and a system for optimizing mixing parameters of a self-adaptive driving emulsification pump, and relates to the technical field of emulsification control, and the method comprises the following steps: reading multi-stage mixing shear parameters and multi-stage preset emulsion droplet particle size characteristics; performing emulsion droplet particle size detection when executing the target emulsification task, generating a multi-stage emulsion droplet particle size detection data set, comparing the multi-stage emulsion droplet particle size detection data set with multi-stage preset emulsion droplet particle size characteristics, tracing particle size deviation, and determining an abnormal shear cavity and an abnormal emulsion diffusion cavity; abnormal diffusion correction is carried out on the abnormal emulsion diffusion cavity, and diffusion cavity optimization mixing parameters and abnormal correction time constraints are generated; and performing mixing parameter compensation on the abnormal shear cavity, and adjusting the multi-stage mixing shear parameters. The technical problems that in the prior art, due to the fact that the shearing cavity and the diffusion cavity are abnormal in the emulsifying process, the emulsion droplet particle size deviation is large, and stable control over the emulsifying quality cannot be achieved are solved, and the technical effects of dynamically compensating mixing parameters and improving the emulsion droplet particle size control precision and the consistency of emulsified products are achieved.

The invention discloses an airplane icing intensity and supercooled large drop forecasting method, which comprises the following steps of: acquiring weather forecasting data including temperature, cloud drop specific mass, cloud drop number concentration, raindrop specific mass and raindrop number concentration of each height layer; recognizing the supercooled cloud drops and the supercooled raindrops according to the temperature, and respectively determining the icing growth rates of the supercooled cloud drops and the supercooled raindrops based on the particle collision efficiency, the specific mass, the number concentration and the flight speed; determining the total icing growth rate by using the icing growth rates of the supercooled cloud drops and the supercooled raindrops; obtaining an icing intensity forecast result through the icing intensity threshold value; and identifying the supercooled large drop according to the diameters of the supercooled cloud drop and the supercooled raindrop. According to the method, cloud microscopic data and the flight speed are combined, so that the precision of airplane ice accretion identification is remarkably improved, and the method has relatively good interpretability and can be directly applied to a flight safety guarantee system.

This invention provides a method and system for testing icing under rotating conditions of supercooled large water droplets, relating to the field of aero-engine icing testing. It aims to address the problem of excessive liquid water content caused by significant settling of supercooled large water droplets and the inability of the uniform cloud zone to cover the test specimen. The method includes: obtaining the projected area S of the rotating test specimen on the test cross-section under rotating conditions. A ; Obtain the overlapping area S of the cloud and fog region between the uniform cloud and fog region and the projected area of ​​the rotating test specimen. B The liquid water content obtained from the calibration test is L. B According to the projected area S A Area S where clouds and fog overlap B and liquid water content of L B The liquid water content L corresponding to the freezing condition of the rotating test piece was obtained. A By using the relative area of ​​the uniform cloud and fog zone and the test zone, liquid water is equivalently transformed. The freezing condition conversion method of the rotating state test under the freezing condition of supercooled large water droplets is adopted, which effectively supports the rotating state test under the freezing condition of supercooled large water droplets.

The present application relates to the technical field of fluid mechanics, and particularly relates to a liquid drop preparation device in a liquid phase environment, which comprises a support frame and a preparation device, the preparation device comprises an outer shape reinforcing piece, a liquid injection assembly, a liquid outlet assembly and a liquid drop collection assembly, two ends of a filament are fixed with the liquid injection assembly and the liquid drop collection assembly respectively, then the liquid outlet flow is controlled through a flow control device in the liquid injection assembly, and then the liquid enters the liquid outlet assembly under the action of gravity, the liquid is uniformly attached to the filament and flows downward along the filament, finally the liquid drop on the filament falls into the liquid drop collection assembly, the flow rate of the viscous drop is actively controlled through the device in the liquid injection assembly, and in addition, the viscosity of the liquid phase environment can be changed, while ensuring the stability of the liquid drop, the size of the liquid drop is controllable within a certain range, and the preparation of a large liquid drop is realized.

An apparatus and method of controlling the formation of droplets for generating EUV radiation. A droplet source includes a fluid exiting a nozzle and a subsystem having an electrically actuable element that creates a disturbance in the fluid. The droplet source produces a stream that breaks into droplets that in turn coalesce into larger droplets as the droplets progress toward an irradiation region. The electrically actuable element is driven by a control signal having a sinusoidal component and a square wave component. Various parameters, such as a phase difference between the sinusoidal component and the square wave component, are measured and controlled to minimize the formation of uncoalesced satellite droplets in the stream.

The present invention provides a method for fabricating lattice-structured parts using large-droplet transition via electron beam fuse deposition. The method comprises: setting an appropriate droplet transition distance before deposition begins; after determining the droplet transition distance, setting electron beam energy and deflection parameters to cause the electron beam to melt a wire; selecting a droplet detachment mode, then melting the wire to form droplets and performing single-layer fuse deposition; after completing single-layer fuse deposition, stopping the electron beam flow and wire transport, cooling the deposited layer until the top temperature is below a threshold; and adjusting the relative position according to part design requirements before depositing the next layer. This method addresses the difficulties and poor quality of existing lattice-structured parts.

The application discloses a glue head dropper with switchable liquid drop size, which is provided with a rubber air bag at one end and a tapered end at the other end, and is provided with a connecting pipe at the middle part of the outer tapered end, wherein the tapered end port is located in the connecting pipe and is provided with a tapered pipe on the tapered end port, a funnel-shaped pipe is fixed in the connecting pipe through a connecting rod, the center lines of the dropper, the connecting pipe, the tapered pipe and the funnel-shaped pipe are coincident, a tapered cover with a small end downward is arranged on the upper port of the funnel-shaped pipe, a liquid leakage hole is formed in the center of the tapered cover, a certain width gap is left between the tapered pipe and the tapered cover, and the inner cavity of the funnel-shaped pipe is composed of an upper cylindrical cavity and a lower cylindrical cavity which are connected into one body. The application can realize the drop addition of small liquid drops and can also realize the drop addition of conventional large liquid drops by using a slow liquid suction mode. The application has the advantages of simple structure, simple operation and low cost.

The application relates to the field of icing prediction, in particular to a verification method, system, equipment, medium and product of an icing prediction model, which comprises the following steps: acquiring a first meteorological sample set and inputting the first meteorological sample set into a neural network for iterative calculation, wherein the input end is T 、 RH 、 P 、 Q cloud 、 Q rain 、 IWC 、 LWC 、 W 、 Q ice 、 N ice and N rain ; the output end is a probability value of MVD; meteorological samples with the probability value belonging to a set probability interval are combined to form a second meteorological sample set, and the second meteorological sample set is input into a convolutional neural network for updated iterative calculation; a first verification index is calculated, which comprises a first ratio of the number of samples correctly classified as large droplets to the actual number of large droplet samples and a second ratio of the number of samples classified as small droplets as large droplets to the actual number of small droplet samples; and whether it is necessary to continue updating is judged according to the first verification index. The application improves the icing prediction accuracy under the condition of small samples.

A supercooled large droplet detector capable of accurately and reliably identifying and distinguishing supercooled large droplet icing weather. The supercooled large droplet detector includes a detector base and a detection structure for detecting supercooled droplets in an air flow and for identifying and distinguishing supercooled large droplet icing weather from icing weather, the detection structure having an outer layer of temperature sensor layer, an intermediate layer of electrically heated film layer, and an inner layer of structural base, the electrically heated film layer providing heating energy through a plurality of electrically heated circuits to maintain a uniform temperature on the surface of the detection structure, the temperature sensor layer having a plurality of temperature sensors, and a controller disposed in the structural base, the controller inferring an impact range of a supercooled droplet by temperature changes at a plurality of different locations caused by the supercooled droplet impacting the detection structure, and determining whether the supercooled droplet that was previously impacted was a supercooled large droplet by determining whether the impact range exceeds a critical impact range for a supercooled droplet of a critical size impacting the detection structure.

A supercooled large droplet icing detector capable of automatically adapting to a sideslip angle of an aircraft, and an aircraft. The supercooled large droplet icing detector capable of automatically adapting to a sideslip angle of an aircraft comprises a probe (1), a wind vane structure (2), a transition structure (3), a support structure (4), a bearing (6), and a rotating shaft (7), wherein a first icing sensor (21) and a second icing sensor (22) are arranged on the probe (1), and are used for detecting an icing condition and distinguishing a supercooled large droplet icing condition; the wind vane structure (2) is connected between the probe (1) and the transition structure (3), and is used for automatically adjusting the probe (1) to follow the airflow direction under the action of wind; the transition structure (3) is connected between the wind vane structure (2) and the rotating shaft (7), and is used for generating an eccentric effect, so that the rotating shaft (7) can be driven to rotate under the force of the wind vane structure (2); the support structure (4) is mounted to an aircraft skin (5), and is used for supporting the supercooled large droplet icing detector; the bearing (6) is sleeved on the outer side of the rotating shaft (7), and is used for supporting and lubricating the rotating shaft (7) to rotate.

This invention relates to a device for detecting supercooled large water droplet icing in aircraft and the aircraft itself. The device includes a detector and a support connected to the detector. The detector comprises a head and a sidewall connected to the head. The head is an open cylinder forming a circular detector inlet. The sidewall is conical, and the detector also includes a central cone located within the sidewall. An annular detector outlet is formed between the tail of the sidewall and the tail of the central cone. A spiral resistance wire is arranged inside the sidewall to detect changes in current after the resistance wire encounters water, triggering an alarm. The inlet flow coefficient of the detector is equal to the ratio of the detector outlet area to the detector inlet area, and the inlet flow coefficient is less than 1. Based on the above technical solution, this invention achieves the following beneficial technical effects: it can effectively distinguish water droplet diameters, thereby detecting supercooled large water droplet icing.

The present application relates to a microfluidic device having an array of micro-pores that enables scalable and parallel multi-step reactions of droplets, and related methods of performing the reactions in two paired micro-pores of different sizes by a plurality of repeating capture cell units and sequential collection and fusion of the droplets. Droplets containing a desired substance or reaction reagent are input onto the microfluidic platform. Each aperture is configured to first capture a larger droplet, then repeatedly capture a smaller droplet, and then fuse the larger and smaller droplets. In some embodiments, this action is facilitated by tilting the chip. In some embodiments, the larger droplets consecutively fuse three paired batches of smaller droplets containing various desired components while incubating between fusing and loading. In alternative embodiments, each capture well has two or more active capture sites, enabling simultaneous fusion of multiple smaller droplets and multiple fusion.

A droplet bandpass filter and method of modifying droplet size distribution of a population of droplets suspended in a gas. Droplets suspended in a gas are flowed through a bandpass filter having a tortuous pathway which comprises at least one impactor region located at a position adjacent to a flow direction change. Larger droplets impact at the impactor region while smaller droplets remain suspended in the gas and flow in the first output direction. Other flow restrictors may advantageously be included in the tortuous pathway. The filter is particularly useful in delivering sterilant aerosols (e.g. peroxides) with reduced populations of large droplets.

The invention discloses a liquid drop collecting device and a liquid drop collecting method.The device comprises a liquid drop collecting assembly and an electric field generating assembly, and the liquid drop collecting assembly comprises a micro-fluidic chip, a liquid drop collecting chip and a liquid drop collecting bottle; the liquid drop collecting chip is respectively communicated with the micro-fluidic chip and the liquid drop collecting bottle, and the liquid drop collecting chip is vertical to the micro-fluidic chip; the liquid drop collecting chip is internally provided with a flow channel communicated with the micro-fluidic chip and the liquid drop collecting bottle, the flow channel comprises a first flow channel extending from the end close to the micro-fluidic chip to the interior of the liquid drop collecting chip, and the first flow channel is vertical to the micro-fluidic chip along the longitudinal direction; the electric field generating assembly is connected with the liquid drop collecting chip and is used for fusing the liquid drops in the liquid drop collecting chip into large liquid drops in a demulsification manner.